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- W3104806321 abstract "Acquiring information about an unknown qubit in a superposition of two states is essential in any computation process. Quantum measurement, or sharp measurement, is usually used to read the information contents of that unknown qubit system. Quantum measurement is an irreversible operation that makes the superposition collapses to one of the two possible states in a probabilistic way. In this paper, a quantum algorithm will be proposed to read the information in an unknown qubit without applying sharp measurement on that qubit. The proposed algorithm will use a quantum feedback control scheme by applying sharp measurement iteratively on an auxiliary qubit weakly entangled with the unknown qubit. The information contents of the unknown qubit can be read by counting the outcomes from the sharp measurement on the auxiliary qubit. Iterative measurements on the auxiliary qubit will make the amplitudes of the superposition move in a random walk manner where a weak measurement is applied on the unknown qubit which can be reversed when the random walk takes opposite steps to decrease the disturbance introduced to the system. The proposed algorithm will define the strength of the weak measurement so that it can be controlled by adding an arbitrary number of dummy qubits $mu$ to the system. This will make the measurement process slowdown to an arbitrary scale so that the effect of the sharp measurement on the unknown qubit is reached after $O(mu^2)$ measurements on the auxiliary qubit." @default.
- W3104806321 created "2020-11-23" @default.
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- W3104806321 date "2017-05-01" @default.
- W3104806321 modified "2023-09-23" @default.
- W3104806321 title "Reading a single qubit system using weak measurement with variable strength" @default.
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- W3104806321 doi "https://doi.org/10.1016/j.aop.2017.03.008" @default.
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